Dell Vostro 200

This turned out to be very unreliable. The best answer seemed to be to start over by installing Ubuntu 7.10.

Install Ubuntu 6.10 on Dell Vostro 200

CD-ROM not detected on installation

Go into BIOS (f2 when booting) and select "Integrated Peripherals". Find "SATA Mode". By default it is set to "IDE" -- change this to "RAID". That may not make sense, but this will allow Linux to see the CD-ROM.